Just wondering if its possible (are there racing rotors?) and the power gains.

 

Your current compression ratio is 9.4, upgrading to s5 9.7:1 rotors would give you a very small increase in fuel economy and power. The RX-8 Renesis rotors are 10.0:1 but have issues with side seals (and apex seals) in the 13B setup. With new rotors you will have to get new counterbalances that matc

There are racing rotors but they are primarily lighhter for higher revs. Racingbeat sells lightened rotors. They cost a bunch.

eally for power gains you're going to want more in the area of porting (like a new cam) a street port opens up the intake and the exhaust some so you can generate power up higher and more of it.